CROPPING SYSTEMS WASHINGTON, OREGON, IDAHO. 
11 
order to include clover in this sort of rotation one of the following 
four-year cropping systems may be used: 
First year. Second year. Third year. Fourth year. 
Corn, beans, pota- Winter wheat, spring Spring wheat, oats, Clover for hay, seed, 
toes, or field peas wheat, oats, bar- barley, or field or pasture, 
planted in rows ley, or field peas. peas. (Grain 
and cultivated in seeded as a nurse 
rows; summer crop with clover. ) 
fallow. 
For farmers who wish to use intertilled crops instead of summer 
fallowing, the first two years of this plan are the same as the first 
two years of the preceding three-year rotations. Farmers who do not 
wish to grow intertilled crops may substitute summer fallow during 
the first season. During the third year spring wheat, oats, barley, 
or field peas is seeded as a nurse crop with clover, and the fourth 
year the clover is used for seed, hay, or pasture. 
CLOVER FOR SEED. 
As clover is a comparatively new crop in the moister sections of 
eastern Washington, eastern Oregon, and northern Idaho, many 
farmers are not familiar with its use. On every farm it is possible 
to utilize a limited acreage of this crop for supplying the live stock 
with hay and pasture. The area so occupied, however, would be 
small in comparison with the total area under cultivation, as only 
a small number of animals are kept per farm. Thus it would not 
be possible to use clover often enough in the rotation materially to 
affect yields if this were the only way in which it could be used. 
By growing it for seed as well as for hay or pasture, however, the 
area devoted to this crop could be increased until from one-fourth to 
one-third of the tillable land would be devoted to clover every year. 
That clover seed may be successfully and profitably produced has 
been proved by several years' experience in parts of Idaho, Lewis, and 
Nez Perce Counties, Idaho. Seed production was started in eastern 
Nez Perce County in 1908 and the first clover seed huller was brought 
into the county a year later. The amount of land devoted to clover 
seed production gradually increased until in 1916 six clover hullers 
were necessary to care for the seed crops. The farmers who have 
grown seed find not only that it is a profitable crop but that the sub- 
sequent grain crops yield from 15 to 25 per cent per acre more than 
from land where clover was never produced. 
